Alloy.



s .No. 824,618.

UNITED I STATES PATENT OFFICE.

ALLOY.

Specification of Letters Patent.

latented June 26,1906.

Application filed March 13, 1906. Serial No. 305,826.

To all whom it may concern/.-

Be it known that I, CHARLES H. BIRMING- HAM, of Baltimore, in the Stateof Maryland, have invented certain new and useful Improvements in Alloysand I do hereby declare the following to be a full, clear, andexactdescriptiori of the invention, such as will enable others skilledin the art to which it appertains to make and use the same. The objectof this invention is to provide an alloy which will be fusibleonly at avery high temperature and one which maybe used as a substitute forplatinum, especially as employed in connection with electricalappliances.

The alloy is com osed of the following ingredientsin about theproportions s ecified to wit, silver, sixteen and one-hai ounces;nickel, four and one-fifth ounds; bismuth, one-half ounce, and goldty-three pennyweights. These proportions, which are ac-.

cording to Troy measure, may be varied without materially altering theproperties of thecompound; but I have found those stated to beproductive of best results.

An alloy composed of the parts specified may be used wherever platinumis now ordinarily requiredf0r instance, as the leadingin wires forincandescent 1 lamps, contactoints for electricvibrators, and, in fact,1n all classes of electrical appliances where high resistance isrequired. T e compound is also highly advantageous in connection withtelephone transmitters, being highly ductive and far more durable thanplatinum.

. I claim as my invention- 1. An alloy composed of silver,nickel,b1smuth and old.

2. An alIoy composed of silver sixteen and one-half ounces, nickel fourand one-fifth pounds, bismuth one-half ounce, and gold fifty-threepennyweights.

n testimony whereof I have signed this specification in the presence oftwo subscribv ing witnesses. I

CHARLES H. BIRMINGHAM.

Witnesses:

FRANCIS S. MAGUIRE, VER ON E. WEST.

